2 % (c) The AQUA Project, Glasgow University, 1994-1996
4 \section[FiniteMap]{An implementation of finite maps}
6 ``Finite maps'' are the heart of the compiler's
7 lookup-tables/environments and its implementation of sets. Important
10 This code is derived from that in the paper:
13 "Efficient sets: a balancing act"
14 Journal of functional programming 3(4) Oct 1993, pp553-562
17 The code is SPECIALIZEd to various highly-desirable types (e.g., Id)
18 near the end (only \tr{#ifdef COMPILING_GHC}).
22 #include "HsVersions.h"
23 #define IF_NOT_GHC(a) {--}
25 #define ASSERT(e) {--}
26 #define IF_NOT_GHC(a) a
28 #define _tagCmp compare
34 #if defined(COMPILING_GHC) && defined(DEBUG_FINITEMAPS)/* NB NB NB */
35 #define OUTPUTABLE_key , Outputable key
37 #define OUTPUTABLE_key {--}
41 FiniteMap, -- abstract type
43 emptyFM, unitFM, listToFM,
61 sizeFM, isEmptyFM, elemFM, lookupFM, lookupWithDefaultFM,
63 fmToList, keysFM, eltsFM
67 , SYN_IE(FiniteSet), emptySet, mkSet, isEmptySet
68 , elementOf, setToList, union, minusSet
72 #if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ <= 201
73 IMPORT_DELOOPER(SpecLoop)
75 import {-# SOURCE #-} Name
78 #if __GLASGOW_HASKELL__ >= 202
81 #if defined(USE_FAST_STRINGS)
85 import Bag ( Bag, foldrBag )
86 import Outputable ( PprStyle, Outputable(..) )
91 # if ! OMIT_NATIVE_CODEGEN
94 # define IF_NCG(a) {--}
98 -- SIGH: but we use unboxed "sizes"...
99 #if __GLASGOW_HASKELL__
100 #define IF_GHC(a,b) a
102 #define IF_GHC(a,b) b
107 %************************************************************************
109 \subsection{The signature of the module}
111 %************************************************************************
115 emptyFM :: FiniteMap key elt
116 unitFM :: key -> elt -> FiniteMap key elt
117 listToFM :: (Ord key OUTPUTABLE_key) => [(key,elt)] -> FiniteMap key elt
118 -- In the case of duplicates, the last is taken
120 bagToFM :: (Ord key OUTPUTABLE_key) => Bag (key,elt) -> FiniteMap key elt
121 -- In the case of duplicates, who knows which is taken
124 -- ADDING AND DELETING
125 -- Throws away any previous binding
126 -- In the list case, the items are added starting with the
127 -- first one in the list
128 addToFM :: (Ord key OUTPUTABLE_key) => FiniteMap key elt -> key -> elt -> FiniteMap key elt
129 addListToFM :: (Ord key OUTPUTABLE_key) => FiniteMap key elt -> [(key,elt)] -> FiniteMap key elt
131 -- Combines with previous binding
132 addToFM_C :: (Ord key OUTPUTABLE_key) => (elt -> elt -> elt)
133 -> FiniteMap key elt -> key -> elt
135 addListToFM_C :: (Ord key OUTPUTABLE_key) => (elt -> elt -> elt)
136 -> FiniteMap key elt -> [(key,elt)]
139 -- Deletion doesn't complain if you try to delete something
141 delFromFM :: (Ord key OUTPUTABLE_key) => FiniteMap key elt -> key -> FiniteMap key elt
142 delListFromFM :: (Ord key OUTPUTABLE_key) => FiniteMap key elt -> [key] -> FiniteMap key elt
145 -- Bindings in right argument shadow those in the left
146 plusFM :: (Ord key OUTPUTABLE_key) => FiniteMap key elt -> FiniteMap key elt
149 -- Combines bindings for the same thing with the given function
150 plusFM_C :: (Ord key OUTPUTABLE_key) => (elt -> elt -> elt)
151 -> FiniteMap key elt -> FiniteMap key elt -> FiniteMap key elt
153 minusFM :: (Ord key OUTPUTABLE_key) => FiniteMap key elt -> FiniteMap key elt -> FiniteMap key elt
154 -- (minusFM a1 a2) deletes from a1 any bindings which are bound in a2
156 intersectFM :: (Ord key OUTPUTABLE_key) => FiniteMap key elt -> FiniteMap key elt -> FiniteMap key elt
157 intersectFM_C :: (Ord key OUTPUTABLE_key) => (elt -> elt -> elt2)
158 -> FiniteMap key elt -> FiniteMap key elt -> FiniteMap key elt2
160 -- MAPPING, FOLDING, FILTERING
161 foldFM :: (key -> elt -> a -> a) -> a -> FiniteMap key elt -> a
162 mapFM :: (key -> elt1 -> elt2) -> FiniteMap key elt1 -> FiniteMap key elt2
163 filterFM :: (Ord key OUTPUTABLE_key) => (key -> elt -> Bool)
164 -> FiniteMap key elt -> FiniteMap key elt
167 sizeFM :: FiniteMap key elt -> Int
168 isEmptyFM :: FiniteMap key elt -> Bool
170 elemFM :: (Ord key OUTPUTABLE_key) => key -> FiniteMap key elt -> Bool
171 lookupFM :: (Ord key OUTPUTABLE_key) => FiniteMap key elt -> key -> Maybe elt
173 :: (Ord key OUTPUTABLE_key) => FiniteMap key elt -> elt -> key -> elt
174 -- lookupWithDefaultFM supplies a "default" elt
175 -- to return for an unmapped key
178 fmToList :: FiniteMap key elt -> [(key,elt)]
179 keysFM :: FiniteMap key elt -> [key]
180 eltsFM :: FiniteMap key elt -> [elt]
183 %************************************************************************
185 \subsection{The @FiniteMap@ data type, and building of same}
187 %************************************************************************
189 Invariants about @FiniteMap@:
192 all keys in a FiniteMap are distinct
194 all keys in left subtree are $<$ key in Branch and
195 all keys in right subtree are $>$ key in Branch
197 size field of a Branch gives number of Branch nodes in the tree
199 size of left subtree is differs from size of right subtree by a
200 factor of at most \tr{sIZE_RATIO}
204 data FiniteMap key elt
206 | Branch key elt -- Key and elt stored here
207 IF_GHC(Int#,Int{-STRICT-}) -- Size >= 1
208 (FiniteMap key elt) -- Children
216 = Branch bottom bottom IF_GHC(0#,0) bottom bottom
218 bottom = panic "emptyFM"
221 -- #define EmptyFM (Branch _ _ IF_GHC(0#,0) _ _)
223 unitFM key elt = Branch key elt IF_GHC(1#,1) emptyFM emptyFM
225 listToFM = addListToFM emptyFM
228 bagToFM = foldrBag (\(k,v) fm -> addToFM fm k v) emptyFM
232 %************************************************************************
234 \subsection{Adding to and deleting from @FiniteMaps@}
236 %************************************************************************
239 addToFM fm key elt = addToFM_C (\ old new -> new) fm key elt
241 addToFM_C combiner EmptyFM key elt = unitFM key elt
242 addToFM_C combiner (Branch key elt size fm_l fm_r) new_key new_elt
243 #ifdef __GLASGOW_HASKELL__
244 = case _tagCmp new_key key of
245 _LT -> mkBalBranch key elt (addToFM_C combiner fm_l new_key new_elt) fm_r
246 _GT -> mkBalBranch key elt fm_l (addToFM_C combiner fm_r new_key new_elt)
247 _EQ -> Branch new_key (combiner elt new_elt) size fm_l fm_r
249 | new_key < key = mkBalBranch key elt (addToFM_C combiner fm_l new_key new_elt) fm_r
250 | new_key > key = mkBalBranch key elt fm_l (addToFM_C combiner fm_r new_key new_elt)
251 | otherwise = Branch new_key (combiner elt new_elt) size fm_l fm_r
254 addListToFM fm key_elt_pairs = addListToFM_C (\ old new -> new) fm key_elt_pairs
256 addListToFM_C combiner fm key_elt_pairs
257 = foldl add fm key_elt_pairs -- foldl adds from the left
259 add fmap (key,elt) = addToFM_C combiner fmap key elt
263 delFromFM EmptyFM del_key = emptyFM
264 delFromFM (Branch key elt size fm_l fm_r) del_key
265 #ifdef __GLASGOW_HASKELL__
266 = case _tagCmp del_key key of
267 _GT -> mkBalBranch key elt fm_l (delFromFM fm_r del_key)
268 _LT -> mkBalBranch key elt (delFromFM fm_l del_key) fm_r
269 _EQ -> glueBal fm_l fm_r
272 = mkBalBranch key elt fm_l (delFromFM fm_r del_key)
275 = mkBalBranch key elt (delFromFM fm_l del_key) fm_r
281 delListFromFM fm keys = foldl delFromFM fm keys
284 %************************************************************************
286 \subsection{Combining @FiniteMaps@}
288 %************************************************************************
291 plusFM_C combiner EmptyFM fm2 = fm2
292 plusFM_C combiner fm1 EmptyFM = fm1
293 plusFM_C combiner fm1 (Branch split_key elt2 _ left right)
294 = mkVBalBranch split_key new_elt
295 (plusFM_C combiner lts left)
296 (plusFM_C combiner gts right)
298 lts = splitLT fm1 split_key
299 gts = splitGT fm1 split_key
300 new_elt = case lookupFM fm1 split_key of
302 Just elt1 -> combiner elt1 elt2
304 -- It's worth doing plusFM specially, because we don't need
305 -- to do the lookup in fm1.
307 plusFM EmptyFM fm2 = fm2
308 plusFM fm1 EmptyFM = fm1
309 plusFM fm1 (Branch split_key elt1 _ left right)
310 = mkVBalBranch split_key elt1 (plusFM lts left) (plusFM gts right)
312 lts = splitLT fm1 split_key
313 gts = splitGT fm1 split_key
315 minusFM EmptyFM fm2 = emptyFM
316 minusFM fm1 EmptyFM = fm1
317 minusFM fm1 (Branch split_key elt _ left right)
318 = glueVBal (minusFM lts left) (minusFM gts right)
319 -- The two can be way different, so we need glueVBal
321 lts = splitLT fm1 split_key -- NB gt and lt, so the equal ones
322 gts = splitGT fm1 split_key -- are not in either.
324 intersectFM fm1 fm2 = intersectFM_C (\ left right -> right) fm1 fm2
326 intersectFM_C combiner fm1 EmptyFM = emptyFM
327 intersectFM_C combiner EmptyFM fm2 = emptyFM
328 intersectFM_C combiner fm1 (Branch split_key elt2 _ left right)
330 | maybeToBool maybe_elt1 -- split_elt *is* in intersection
331 = mkVBalBranch split_key (combiner elt1 elt2) (intersectFM_C combiner lts left)
332 (intersectFM_C combiner gts right)
334 | otherwise -- split_elt is *not* in intersection
335 = glueVBal (intersectFM_C combiner lts left) (intersectFM_C combiner gts right)
338 lts = splitLT fm1 split_key -- NB gt and lt, so the equal ones
339 gts = splitGT fm1 split_key -- are not in either.
341 maybe_elt1 = lookupFM fm1 split_key
342 Just elt1 = maybe_elt1
345 %************************************************************************
347 \subsection{Mapping, folding, and filtering with @FiniteMaps@}
349 %************************************************************************
352 foldFM k z EmptyFM = z
353 foldFM k z (Branch key elt _ fm_l fm_r)
354 = foldFM k (k key elt (foldFM k z fm_r)) fm_l
356 mapFM f EmptyFM = emptyFM
357 mapFM f (Branch key elt size fm_l fm_r)
358 = Branch key (f key elt) size (mapFM f fm_l) (mapFM f fm_r)
360 filterFM p EmptyFM = emptyFM
361 filterFM p (Branch key elt _ fm_l fm_r)
362 | p key elt -- Keep the item
363 = mkVBalBranch key elt (filterFM p fm_l) (filterFM p fm_r)
365 | otherwise -- Drop the item
366 = glueVBal (filterFM p fm_l) (filterFM p fm_r)
369 %************************************************************************
371 \subsection{Interrogating @FiniteMaps@}
373 %************************************************************************
376 --{-# INLINE sizeFM #-}
378 sizeFM (Branch _ _ size _ _) = IF_GHC(I# size, size)
380 isEmptyFM fm = sizeFM fm == 0
382 lookupFM EmptyFM key = Nothing
383 lookupFM (Branch key elt _ fm_l fm_r) key_to_find
384 #ifdef __GLASGOW_HASKELL__
385 = case _tagCmp key_to_find key of
386 _LT -> lookupFM fm_l key_to_find
387 _GT -> lookupFM fm_r key_to_find
390 | key_to_find < key = lookupFM fm_l key_to_find
391 | key_to_find > key = lookupFM fm_r key_to_find
392 | otherwise = Just elt
396 = case (lookupFM fm key) of { Nothing -> False; Just elt -> True }
398 lookupWithDefaultFM fm deflt key
399 = case (lookupFM fm key) of { Nothing -> deflt; Just elt -> elt }
402 %************************************************************************
404 \subsection{Listifying @FiniteMaps@}
406 %************************************************************************
409 fmToList fm = foldFM (\ key elt rest -> (key,elt) : rest) [] fm
410 keysFM fm = foldFM (\ key elt rest -> key : rest) [] fm
411 eltsFM fm = foldFM (\ key elt rest -> elt : rest) [] fm
415 %************************************************************************
417 \subsection{The implementation of balancing}
419 %************************************************************************
421 %************************************************************************
423 \subsubsection{Basic construction of a @FiniteMap@}
425 %************************************************************************
427 @mkBranch@ simply gets the size component right. This is the ONLY
428 (non-trivial) place the Branch object is built, so the ASSERTion
429 recursively checks consistency. (The trivial use of Branch is in
436 mkBranch :: (Ord key OUTPUTABLE_key) -- Used for the assertion checking only
439 -> FiniteMap key elt -> FiniteMap key elt
442 mkBranch which key elt fm_l fm_r
443 = --ASSERT( left_ok && right_ok && balance_ok )
444 #if defined(COMPILING_GHC) && defined(DEBUG_FINITEMAPS)
445 if not ( left_ok && right_ok && balance_ok ) then
446 pprPanic ("mkBranch:"++show which) (vcat [ppr PprDebug [left_ok, right_ok, balance_ok],
453 result = Branch key elt (unbox (1 + left_size + right_size)) fm_l fm_r
455 -- if sizeFM result <= 8 then
458 -- pprTrace ("mkBranch:"++(show which)) (ppr PprDebug result) (
462 left_ok = case fm_l of
464 Branch left_key _ _ _ _ -> let
465 biggest_left_key = fst (findMax fm_l)
467 biggest_left_key < key
468 right_ok = case fm_r of
470 Branch right_key _ _ _ _ -> let
471 smallest_right_key = fst (findMin fm_r)
473 key < smallest_right_key
474 balance_ok = True -- sigh
477 = -- Both subtrees have one or no elements...
478 (left_size + right_size <= 1)
479 -- NO || left_size == 0 -- ???
480 -- NO || right_size == 0 -- ???
481 -- ... or the number of elements in a subtree does not exceed
482 -- sIZE_RATIO times the number of elements in the other subtree
483 || (left_size * sIZE_RATIO >= right_size &&
484 right_size * sIZE_RATIO >= left_size)
487 left_size = sizeFM fm_l
488 right_size = sizeFM fm_r
490 #ifdef __GLASGOW_HASKELL__
492 unbox (I# size) = size
499 %************************************************************************
501 \subsubsection{{\em Balanced} construction of a @FiniteMap@}
503 %************************************************************************
505 @mkBalBranch@ rebalances, assuming that the subtrees aren't too far
509 mkBalBranch :: (Ord key OUTPUTABLE_key)
511 -> FiniteMap key elt -> FiniteMap key elt
514 mkBalBranch key elt fm_L fm_R
516 | size_l + size_r < 2
517 = mkBranch 1{-which-} key elt fm_L fm_R
519 | size_r > sIZE_RATIO * size_l -- Right tree too big
521 Branch _ _ _ fm_rl fm_rr
522 | sizeFM fm_rl < 2 * sizeFM fm_rr -> single_L fm_L fm_R
523 | otherwise -> double_L fm_L fm_R
524 -- Other case impossible
526 | size_l > sIZE_RATIO * size_r -- Left tree too big
528 Branch _ _ _ fm_ll fm_lr
529 | sizeFM fm_lr < 2 * sizeFM fm_ll -> single_R fm_L fm_R
530 | otherwise -> double_R fm_L fm_R
531 -- Other case impossible
533 | otherwise -- No imbalance
534 = mkBranch 2{-which-} key elt fm_L fm_R
540 single_L fm_l (Branch key_r elt_r _ fm_rl fm_rr)
541 = mkBranch 3{-which-} key_r elt_r (mkBranch 4{-which-} key elt fm_l fm_rl) fm_rr
543 double_L fm_l (Branch key_r elt_r _ (Branch key_rl elt_rl _ fm_rll fm_rlr) fm_rr)
544 = mkBranch 5{-which-} key_rl elt_rl (mkBranch 6{-which-} key elt fm_l fm_rll)
545 (mkBranch 7{-which-} key_r elt_r fm_rlr fm_rr)
547 single_R (Branch key_l elt_l _ fm_ll fm_lr) fm_r
548 = mkBranch 8{-which-} key_l elt_l fm_ll (mkBranch 9{-which-} key elt fm_lr fm_r)
550 double_R (Branch key_l elt_l _ fm_ll (Branch key_lr elt_lr _ fm_lrl fm_lrr)) fm_r
551 = mkBranch 10{-which-} key_lr elt_lr (mkBranch 11{-which-} key_l elt_l fm_ll fm_lrl)
552 (mkBranch 12{-which-} key elt fm_lrr fm_r)
557 mkVBalBranch :: (Ord key OUTPUTABLE_key)
559 -> FiniteMap key elt -> FiniteMap key elt
562 -- Assert: in any call to (mkVBalBranch_C comb key elt l r),
563 -- (a) all keys in l are < all keys in r
564 -- (b) all keys in l are < key
565 -- (c) all keys in r are > key
567 mkVBalBranch key elt EmptyFM fm_r = addToFM fm_r key elt
568 mkVBalBranch key elt fm_l EmptyFM = addToFM fm_l key elt
570 mkVBalBranch key elt fm_l@(Branch key_l elt_l _ fm_ll fm_lr)
571 fm_r@(Branch key_r elt_r _ fm_rl fm_rr)
572 | sIZE_RATIO * size_l < size_r
573 = mkBalBranch key_r elt_r (mkVBalBranch key elt fm_l fm_rl) fm_rr
575 | sIZE_RATIO * size_r < size_l
576 = mkBalBranch key_l elt_l fm_ll (mkVBalBranch key elt fm_lr fm_r)
579 = mkBranch 13{-which-} key elt fm_l fm_r
586 %************************************************************************
588 \subsubsection{Gluing two trees together}
590 %************************************************************************
592 @glueBal@ assumes its two arguments aren't too far out of whack, just
593 like @mkBalBranch@. But: all keys in first arg are $<$ all keys in
597 glueBal :: (Ord key OUTPUTABLE_key)
598 => FiniteMap key elt -> FiniteMap key elt
601 glueBal EmptyFM fm2 = fm2
602 glueBal fm1 EmptyFM = fm1
604 -- The case analysis here (absent in Adams' program) is really to deal
605 -- with the case where fm2 is a singleton. Then deleting the minimum means
606 -- we pass an empty tree to mkBalBranch, which breaks its invariant.
607 | sizeFM fm2 > sizeFM fm1
608 = mkBalBranch mid_key2 mid_elt2 fm1 (deleteMin fm2)
611 = mkBalBranch mid_key1 mid_elt1 (deleteMax fm1) fm2
613 (mid_key1, mid_elt1) = findMax fm1
614 (mid_key2, mid_elt2) = findMin fm2
617 @glueVBal@ copes with arguments which can be of any size.
618 But: all keys in first arg are $<$ all keys in second.
621 glueVBal :: (Ord key OUTPUTABLE_key)
622 => FiniteMap key elt -> FiniteMap key elt
625 glueVBal EmptyFM fm2 = fm2
626 glueVBal fm1 EmptyFM = fm1
627 glueVBal fm_l@(Branch key_l elt_l _ fm_ll fm_lr)
628 fm_r@(Branch key_r elt_r _ fm_rl fm_rr)
629 | sIZE_RATIO * size_l < size_r
630 = mkBalBranch key_r elt_r (glueVBal fm_l fm_rl) fm_rr
632 | sIZE_RATIO * size_r < size_l
633 = mkBalBranch key_l elt_l fm_ll (glueVBal fm_lr fm_r)
635 | otherwise -- We now need the same two cases as in glueBal above.
638 (mid_key_l,mid_elt_l) = findMax fm_l
639 (mid_key_r,mid_elt_r) = findMin fm_r
644 %************************************************************************
646 \subsection{Local utilities}
648 %************************************************************************
651 splitLT, splitGT :: (Ord key OUTPUTABLE_key) => FiniteMap key elt -> key -> FiniteMap key elt
653 -- splitLT fm split_key = fm restricted to keys < split_key
654 -- splitGT fm split_key = fm restricted to keys > split_key
656 splitLT EmptyFM split_key = emptyFM
657 splitLT (Branch key elt _ fm_l fm_r) split_key
658 #ifdef __GLASGOW_HASKELL__
659 = case _tagCmp split_key key of
660 _LT -> splitLT fm_l split_key
661 _GT -> mkVBalBranch key elt fm_l (splitLT fm_r split_key)
664 | split_key < key = splitLT fm_l split_key
665 | split_key > key = mkVBalBranch key elt fm_l (splitLT fm_r split_key)
669 splitGT EmptyFM split_key = emptyFM
670 splitGT (Branch key elt _ fm_l fm_r) split_key
671 #ifdef __GLASGOW_HASKELL__
672 = case _tagCmp split_key key of
673 _GT -> splitGT fm_r split_key
674 _LT -> mkVBalBranch key elt (splitGT fm_l split_key) fm_r
677 | split_key > key = splitGT fm_r split_key
678 | split_key < key = mkVBalBranch key elt (splitGT fm_l split_key) fm_r
682 findMin :: FiniteMap key elt -> (key,elt)
683 findMin (Branch key elt _ EmptyFM _) = (key,elt)
684 findMin (Branch key elt _ fm_l _) = findMin fm_l
686 deleteMin :: (Ord key OUTPUTABLE_key) => FiniteMap key elt -> FiniteMap key elt
687 deleteMin (Branch key elt _ EmptyFM fm_r) = fm_r
688 deleteMin (Branch key elt _ fm_l fm_r) = mkBalBranch key elt (deleteMin fm_l) fm_r
690 findMax :: FiniteMap key elt -> (key,elt)
691 findMax (Branch key elt _ _ EmptyFM) = (key,elt)
692 findMax (Branch key elt _ _ fm_r) = findMax fm_r
694 deleteMax :: (Ord key OUTPUTABLE_key) => FiniteMap key elt -> FiniteMap key elt
695 deleteMax (Branch key elt _ fm_l EmptyFM) = fm_l
696 deleteMax (Branch key elt _ fm_l fm_r) = mkBalBranch key elt fm_l (deleteMax fm_r)
699 %************************************************************************
701 \subsection{Output-ery}
703 %************************************************************************
706 #if defined(COMPILING_GHC) && defined(DEBUG_FINITEMAPS)
708 instance (Outputable key) => Outputable (FiniteMap key elt) where
709 ppr sty fm = pprX sty fm
711 pprX sty EmptyFM = char '!'
712 pprX sty (Branch key elt sz fm_l fm_r)
713 = parens (hcat [pprX sty fm_l, space,
714 ppr sty key, space, int (IF_GHC(I# sz, sz)), space,
718 #ifndef COMPILING_GHC
719 instance (Eq key, Eq elt) => Eq (FiniteMap key elt) where
720 fm_1 == fm_2 = (sizeFM fm_1 == sizeFM fm_2) && -- quick test
721 (fmToList fm_1 == fmToList fm_2)
723 {- NO: not clear what The Right Thing to do is:
724 instance (Ord key, Ord elt) => Ord (FiniteMap key elt) where
725 fm_1 <= fm_2 = (sizeFM fm_1 <= sizeFM fm_2) && -- quick test
726 (fmToList fm_1 <= fmToList fm_2)
731 %************************************************************************
733 \subsection{FiniteSets---a thin veneer}
735 %************************************************************************
740 type FiniteSet key = FiniteMap key ()
741 emptySet :: FiniteSet key
742 mkSet :: (Ord key OUTPUTABLE_key) => [key] -> FiniteSet key
743 isEmptySet :: FiniteSet key -> Bool
744 elementOf :: (Ord key OUTPUTABLE_key) => key -> FiniteSet key -> Bool
745 minusSet :: (Ord key OUTPUTABLE_key) => FiniteSet key -> FiniteSet key -> FiniteSet key
746 setToList :: FiniteSet key -> [key]
747 union :: (Ord key OUTPUTABLE_key) => FiniteSet key -> FiniteSet key -> FiniteSet key
750 mkSet xs = listToFM [ (x, ()) | x <- xs]
751 isEmptySet = isEmptyFM
760 %************************************************************************
762 \subsection{Efficiency pragmas for GHC}
764 %************************************************************************
766 When the FiniteMap module is used in GHC, we specialise it for
767 \tr{Uniques}, for dastardly efficiency reasons.
770 #if defined(COMPILING_GHC) && __GLASGOW_HASKELL__ && !defined(REALLY_HASKELL_1_3)
772 {-# SPECIALIZE addListToFM
773 :: FiniteMap (FAST_STRING, FAST_STRING) elt -> [((FAST_STRING, FAST_STRING),elt)] -> FiniteMap (FAST_STRING, FAST_STRING) elt
774 , FiniteMap RdrName elt -> [(RdrName,elt)] -> FiniteMap RdrName elt
775 IF_NCG(COMMA FiniteMap Reg elt -> [(Reg COMMA elt)] -> FiniteMap Reg elt)
777 {-# SPECIALIZE addListToFM_C
778 :: (elt -> elt -> elt) -> FiniteMap TyCon elt -> [(TyCon,elt)] -> FiniteMap TyCon elt
779 , (elt -> elt -> elt) -> FiniteMap FAST_STRING elt -> [(FAST_STRING,elt)] -> FiniteMap FAST_STRING elt
780 IF_NCG(COMMA (elt -> elt -> elt) -> FiniteMap Reg elt -> [(Reg COMMA elt)] -> FiniteMap Reg elt)
782 {-# SPECIALIZE addToFM
783 :: FiniteMap CLabel elt -> CLabel -> elt -> FiniteMap CLabel elt
784 , FiniteMap FAST_STRING elt -> FAST_STRING -> elt -> FiniteMap FAST_STRING elt
785 , FiniteMap (FAST_STRING, FAST_STRING) elt -> (FAST_STRING, FAST_STRING) -> elt -> FiniteMap (FAST_STRING, FAST_STRING) elt
786 , FiniteMap RdrName elt -> RdrName -> elt -> FiniteMap RdrName elt
787 IF_NCG(COMMA FiniteMap Reg elt -> Reg -> elt -> FiniteMap Reg elt)
789 {-# SPECIALIZE addToFM_C
790 :: (elt -> elt -> elt) -> FiniteMap (RdrName, RdrName) elt -> (RdrName, RdrName) -> elt -> FiniteMap (RdrName, RdrName) elt
791 , (elt -> elt -> elt) -> FiniteMap FAST_STRING elt -> FAST_STRING -> elt -> FiniteMap FAST_STRING elt
792 IF_NCG(COMMA (elt -> elt -> elt) -> FiniteMap Reg elt -> Reg -> elt -> FiniteMap Reg elt)
794 {-# SPECIALIZE bagToFM
795 :: Bag (FAST_STRING,elt) -> FiniteMap FAST_STRING elt
797 {-# SPECIALIZE delListFromFM
798 :: FiniteMap RdrName elt -> [RdrName] -> FiniteMap RdrName elt
799 , FiniteMap FAST_STRING elt -> [FAST_STRING] -> FiniteMap FAST_STRING elt
800 IF_NCG(COMMA FiniteMap Reg elt -> [Reg] -> FiniteMap Reg elt)
802 {-# SPECIALIZE listToFM
803 :: [([Char],elt)] -> FiniteMap [Char] elt
804 , [(FAST_STRING,elt)] -> FiniteMap FAST_STRING elt
805 , [((FAST_STRING,FAST_STRING),elt)] -> FiniteMap (FAST_STRING, FAST_STRING) elt
806 IF_NCG(COMMA [(Reg COMMA elt)] -> FiniteMap Reg elt)
808 {-# SPECIALIZE lookupFM
809 :: FiniteMap CLabel elt -> CLabel -> Maybe elt
810 , FiniteMap [Char] elt -> [Char] -> Maybe elt
811 , FiniteMap FAST_STRING elt -> FAST_STRING -> Maybe elt
812 , FiniteMap (FAST_STRING,FAST_STRING) elt -> (FAST_STRING,FAST_STRING) -> Maybe elt
813 , FiniteMap RdrName elt -> RdrName -> Maybe elt
814 , FiniteMap (RdrName,RdrName) elt -> (RdrName,RdrName) -> Maybe elt
815 IF_NCG(COMMA FiniteMap Reg elt -> Reg -> Maybe elt)
817 {-# SPECIALIZE lookupWithDefaultFM
818 :: FiniteMap FAST_STRING elt -> elt -> FAST_STRING -> elt
819 IF_NCG(COMMA FiniteMap Reg elt -> elt -> Reg -> elt)
821 {-# SPECIALIZE plusFM
822 :: FiniteMap RdrName elt -> FiniteMap RdrName elt -> FiniteMap RdrName elt
823 , FiniteMap FAST_STRING elt -> FiniteMap FAST_STRING elt -> FiniteMap FAST_STRING elt
824 IF_NCG(COMMA FiniteMap Reg elt -> FiniteMap Reg elt -> FiniteMap Reg elt)
826 {-# SPECIALIZE plusFM_C
827 :: (elt -> elt -> elt) -> FiniteMap FAST_STRING elt -> FiniteMap FAST_STRING elt -> FiniteMap FAST_STRING elt
828 IF_NCG(COMMA (elt -> elt -> elt) -> FiniteMap Reg elt -> FiniteMap Reg elt -> FiniteMap Reg elt)
831 #endif {- compiling for GHC -}